Abstract
The invention relates to a device (10) for data acquisition and measurement acquisition for a door handle (2) of a vehicle (1), said device comprising: at least one communications device (11), in particular an NFC device (11) for NFC data exchange with an external communications terminal (3); and at least one sensor device (12) for measuring (20) a change in capacitance.
According to the invention, just one voltage device (14) is provided for common adjustment of the voltages of the at least one communications device (11) and the at least one sensor device (12).
Claims
1. A device for data and measurement acquisition for a door handle of a vehicle comprising at least one communication device, and at least one sensor device for measurements of a change in capacitance, wherein precisely one voltage device for conjoint voltage adjustment of the at least one communication device and the at least one sensor device is provided.
2. The device according to claim 1, wherein the sensor device has an evaluation and control device and at least one sensor unit a control of the communication device as well as the at least one sensor preferably being implementable via the evaluation and control device.
3. The device according to claim 1, wherein for detecting at least input signals or output signals, the evaluation and control device is electrically connected to at least the communication device or at least one sensor unit, and in particular disruptions of the measurement caused by the communication device can be reduced so that the evaluation and control device monitors at least the input or output signals.
4. The device according to claim 1, wherein the voltage adjustment of the communication device and the sensor device can be directly carried out via the voltage device.
5. The device according to claim 2, wherein an at least partially simultaneous operation of the communication device and the sensor device at an instant can be metrologically detected by an evaluation and control device.
6. The device according to claim 2, wherein the evaluation and control device has a data connection, in particular an SPI connection, at least to the communication device, to at least one sensor unit or to the vehicle electronics.
7. The device according to claim 2, wherein via the evaluation and control device, data from the data exchange of the communication device, can be at least received, evaluated or transferred to vehicle electronics that can be connected to the evaluation and control device.
8. The device according to claim 1, wherein a non-volatile memory unit is provided, the non-volatile memory unit including data, the data being at least transferable and/or receivable by the communication device.
9. The device according to claim 1, wherein a switching unit is provided to switch between an operation of at least one sensor unit of the sensor device and the communication device in order to reduce disruptions of the measurement.
10. A method for operating a device for data and measurement acquisition for a door handle of a vehicle comprising at least one communication device and at least one sensor device for measurement of a change in capacitance, wherein precisely one voltage device serves for conjoint voltage adjustment of the at least one communication device and the at least one sensor device.
11. The method according to claim 10, wherein control via the evaluation and control device takes place in such a manner that the disruptions of the measurement by the sensor device caused by an operation of the communication device are prevented.
12. The method according to claim 10, wherein a measurement by the sensor device is cyclically initiated by the evaluation and control device and a query by the communication device is carried out in temporal dependency on the measurement.
13. The method according to claim 10, wherein the communication device and the sensor device at least are operated via the voltage device with an equal electrical operating voltage or are connected to an equal electrical potential.
14. The method according to claim 10, wherein a query is cyclically carried out by the communication device in order to detect a communication-ready, external communication device such a query of the communication device always being metrologically determined by the evaluation and control device.
15. The method according to claim 10, wherein erroneous measurements with the measurement of the sensor device are at least prevented or reduced by the communication device and the sensor device being temporally sequentially operated by the evaluation and control unit.
16. The method according to claim 10, wherein, upon recognition of a communication-ready external communication device, the communication device sends an interrupt request to the evaluation and control unit in particular to initiate a data exchange, the evaluation and control device interrupting the measurement acquisition of the sensor device, in particular during the data exchange.
17. The method according to claim wherein, the evaluation and control device carries out the measurement acquisition of the sensor device at least as a function of an output signal from the communication device that is received by the evaluation and control unit, or as a function of an input signal sent by the evaluation and control device to the communication device.
18. The device according to claim 1, wherein the communication device is an NFC device for NFC data exchange with an external communication device.
19. The devices according to claim 9, wherein the switching unit is integrated in the evaluation and control unit.
20. The method according to claim 11, wherein control via the evaluation and control device takes place in such a manner that the disruptions of the measurement by the sensor device caused by an operation of the communication device are prevented by the evaluation and control device at least detecting or blocking a simultaneous operation of the communication device and the sensor device.
Description
[0045] In the subsequent figures, identical reference numbers are used for the same technical features, even for those of different exemplary embodiments.
[0046] In FIG. 1a, a vehicle 1 according to the invention is shown schematically in a side view, a device 10 according to the invention being arranged, for example, in a door handle 2 according to the invention. Obviously, the device 10 according to the invention as well as the door handle 2 according to the invention can be arranged on all doors, such as driver and passenger side of the vehicle or motor vehicle 1. Here it is also obvious that an arrangement of the device 10 according to the invention on, for example, the handle to open the trunk lid is also possible. All the features that are thus described in connection with the expression “door handle”, as obviously also valid for any other handle of the vehicle 1, such as on the trunk lid or hood. An external, in particular mobile, communication device 3, such as a smartphone or laptop, is also shown that has, for example, an NFC interface in order to communicate with the communication device 11, in particular NFC device 11 of the device 10 according to the invention. In addition to the NFC device 11, the device 10 has a sensor device 12 for detecting the approach of an object 4. This is more closely shown in FIG. 1b, a detection area 5 of the sensor device 12 being depicted in a simplified way by dashed lines. The object 4, which is found in the detection area 5 (meaning the area within the dashed lines) and/or enters into the detection area 5, causes a change in capacitance that can be measured by the sensor device 12 in the context of a measurement 20.
[0047] As is apparent from FIGS. 1a and 1b, a conjoint arrangement in door handle 2 is provided because of the small communication distance of the NFC device 11 as well as of the detection area 5 of the sensor device 12 in the area of the door handle 2. This ensures that, when an operator approaches, which usually happens within the detection area 5 for opening the door, NFC device 11 can also speak to the operator's communication device 3 (for example, for authentication). This has proven to be disadvantageous, in that the measurement 20 by the sensor device 12 is strongly disrupted by an operation of the NFC device 11. This is discussed in more detail below.
[0048] In order to prevent such disruptions, it is therefore known from prior art, as illustrated in FIG. 2, to provide a first voltage device 14a for the sensor device 12, as well as a second voltage device 14b for the NFC device 11 separate and galvanically separated and/or structurally isolated from the first voltage device 14a. Since voltage fluctuations 22.1 arise during the operation of the NFC device 11, in particular during a query and a data exchange, a separate voltage adjustment, meaning, for example, voltage regulation, must take place in the known solutions for similar devices according to FIG. 2. This, however, has the disadvantage that, because of at least two separate voltage devices 14 for voltage adjustment, the device is costlier and more complex to manufacture.
[0049] To further understanding, an operating voltage profile 22 is illustrated in FIG. 3, the NFC device 11 being placed in operation at instants t1 and t2 (for example, by a query by the NFC device or a data connection or data exchange). At these instants t1 and t2, therefore, the power requirement for the NFC device 11 is increased and causes the described voltage fluctuation 22.1. The influence of the voltage fluctuations 22.1 is clear in an enlarged area 22.2. Shortly before instant t1, a valid measurement 20.2 by the sensor device 12 takes place. This measurement exceeds reference voltage Uref. Therefore, by this measurement 20.2 the statement can be made that no significant change in capacitance has taken place and thus no object 4 has entered the detection area 5. It is now assumed that no significant change in capacitance or approach of object 4 has occurred at instant t2. Because of the voltage fluctuation 22.1, the next measured value 20.3, however, is below reference voltage Uref. The sensor device 12 therefore falsely reports a change in capacitance or an approach. Measurement 20.3 is thus an invalid measurement 20.3. Such voltage fluctuations 22.1 increasingly occur if a conjoint voltage adjustment of the NFC device 11 and the sensor device 12 is performed using a single voltage device 14. The erroneous measurement can unfortunately result in an erroneous function of the vehicle 1, in which, for example, the doors are opened.
[0050] In FIG. 4, the construction of the device 10 according to a first exemplary embodiment is shown, precisely one voltage device 14 being provided. Voltage device 14 has an input voltage (supply voltage (Ue) and stabilizes this, meaning outputs an operating voltage Ub, which is stabilized or regulated by the voltage device 14 at a predetermined operating voltage Uh. This process corresponds to the voltage adjustment by the voltage device 14. Operating the voltage Ub serves in particular to supply power, that is, to operate, the NFC device 11 as well as the sensor device 12. In this arrangement, the sensor device 12 has an evaluation and control unit 13, which is directly connected to voltage device 14 and thus receives the power supply for the entire sensor unit 12 and, as needed, transmits it to the sensor units 12.1. The NFC device 11 is also connected directly to the voltage device 14. In addition, the sensor device 12 has sensor unit 12.1 that, for example, represents a capacitive detector for the sensor device 12. The power for the sensor unit 12.1 is supplied via the evaluation and control device 13. However, the voltage adjustment of the power supply for the sensor unit 12.1 is directly dependent on the voltage device 14 since no other voltage devices 14 or other devices for voltage adjustment are provided. It is also shown by a dashed line that the evaluation and control device 13 has a data connection and/or an electrical connection to the NFC device 11. In this manner, it is possible for the evaluation and control unit 13 to monitor, for example, the input and output signals of the NFC device 11. If necessary, evaluation electronics for the NFC device 12 can thus also be integrated into the evaluation and control device 13.
[0051] FIG. 5 shows how erroneous measurements 20.3 in a measurement 20 by the sensor device 12 caused by voltage fluctuations 22.1 can be reduced. Measurement 20 by the sensor device 12 and simultaneous, a parallel operating profile 21 of the NFC device 11 is thus schematically represented in a corresponding diagram. The temporal profile t of the measurement 20 or of the operating profile 21 is shown here in particular. The same instants of diagrams 20, 21 thus lie directly atop each other in the representation in FIG. 5. It can be seen that, for the capacitance measurement 20 for the sensor device 12, discharge pulses 20.1 are counted in regular intervals, meaning cyclically, until discharge, that is, until reference voltage Uref is reached. For this, clocked discharge of a reference capacitor parallel to the capacitance to be measured takes place, wherein the pulses necessary for discharge can be represented by the illustrated discharge pulse 20.1. Measurements 20.2a and 20.2b thus represent first (20.2a) and second (20.2b) valid measurements, wherein a reduction in the number of discharge pulses 20.1 and thus a change in capacitance can be determined here. No operation of NFC device 11 occurs at the same time as measurements 20.2a and 20.2b. However, evaluation and control device 13 recognizes that, simultaneously to measurements 20.3, interrogation pulse 21.1 by the NFC device 11 and an NFC data exchange 21.2 occurs. These measurements 20.3, consequently interpreted as invalid, are therefore appropriately marked or directly rejected by the evaluation and control device 13. In this manner, invalid measurements 20.3 having erroneous measurement values because of disruptions of measurement 20 can be avoided.
[0052] In FIG. 6, a procedure to reduce erroneous measurements 20.3 according to a further exemplary embodiment of the device 10 according to the invention is shown. In this case, evaluation and control device 13 also recognizes the operation of the NFC device 11. However, instead of performing a measurement 20 at this instant and discarding or marking the corresponding erroneous measurements from measurement 20.3, the evaluation and control device 13 instead interrupts the operation, in particular the measurement 20 by the sensor device 12. There is therefore no recording of measured values at these instants. This has, for example, the advantage of further energy savings and a less-complex evaluation.
[0053] FIG. 7 shows a schematic design of a device according to the invention according to a further exemplary embodiment. Here it can be seen that the evaluation and control device 13 is electrically connected to the NFC device 11 as well as to the sensor units 12.1, as is represented with a dashed connecting line. The sensor device 12 here has the evaluation and control device 13 as well as a first sensor unit 12.1a and a second sensor unit 12.1b. For improved measurement precision in the sensor device 12, it is also conceivable that still more sensor units 12.1 could be provided. For controlling the NFC device 11, the evaluation and control device 13 also includes an NFC control unit 13.3, which is designed, for example, as a data interface. Likewise, a sensor control unit 13.4 is provided, that is connected to the sensor units 12.1 and can carry out a control and/or measurement evaluation for sensor units 12.1. For this, the sensor control unit 13.4 has, for example, an integrated circuit for capacitance measurement 20, for example, by means of the discharge procedure. The sensor control unit 13.4 as well as the NFC control unit 13.3 are connected to a memory unit 13.1, in particular a non-volatile memory unit 13.1, and an interface unit 13.2 for the vehicle electronics. The evaluation and control device 13 includes the memory unit 13.1 and the interface unit 13.2 or integrates these within an integrated circuit. With this, for example, measured capacitance values from the sensor device 12 or data received by the NFC device 11 can be delivered to the vehicle electronics via the interface unit 13.2. Storage of these data in the memory unit 13.1 is also possible, so that these data can be transferred, for example, by the NFC device 11, to an eternal communication device.
[0054] In FIG. 8, an additional schematic representation of an additional exemplary embodiment of the device 10 according to the invention is shown. In order to prevent simultaneous operation of the NFC device 11 and the sensor device 12, the evaluation and control device 13 has a switch unit 13.5. This switch unit 13.5 can switch between an operation and/or a measurement acquisition and/or a power supply of the sensor unit 12.1 and an operation and/or data acquisition and/or a power supply of NFC device 11. The switch unit 13.5 can thus have and/or control a changeover switch, in which, for example, the voltage device 14 is electrically connected to or switched between the evaluation and control device 13, the NFC device 11 and/or the sensor unit 12.1 in order to be able to influence the circuit, as needed.
[0055] As is shown in FIG. 9, the changeover switch can also be integrated into the evaluation and control device 13 of the sensor device 12. Thus it may be possible that the power supply for the sensor units 12.1 and for the NFC device 11 takes place via connections of the evaluation and control device 13. The connections are then connected to the changeover switch to control the power supply.
[0056] FIG. 10 shows a schematic cross-section of a door handle 2 according to the invention, the arrangement of the device 10 according to the invention, in particular in the interior of the door handle 2, being schematically illustrated. The door handle 2 is arranged here so that it can swivel on an outer surface or door panel 2.2 of a door of a vehicle 1, and has a handle recess 2.1 on the vehicle side. To open or unlock the door, for example, an approach of a hand while gripping into the handle recess 2.1 is detected by the sensor device 12. For opening, the door handle 2 can then be moved or pivoted in the direction of the illustrated arrow. The detection range 5 of the sensor device 12 extends to detect the engagement within the handle recess 2.1, a first sensor unit 12.1a of the sensor device 12 serving as a measurement probe for the change in capacitance caused by the approach. In addition to the first sensor unit 12.1a, a second sensor unit 12.1b is integrated into the door handle 2, whose detection range 5 is away from the handle recess 2.1 in the area of the front side of the door handle 2. Thus, the approach of a hand to close the door handle 2 can be detected, for example, by the second sensor unit 12.1b. This is particularly useful if the device 10 according to the invention is used for a KeylessGo system in the vehicle 1. In this context, an operator just carries an external communication device 3, for example an ID transmitter, laptop or smartphone, which automatically initiates an authentication with the communication device 3 upon detection of an approach by the sensor device 12. In addition, upon an approach an NFC data exchange 21.2 can be initiated, for example, by the sensor device 12 and/or an interrogation pulse 21.1 from NFC device 11. Within the door handle 2, the NFC device 11 thus can also be arranged in particular adjacent to (and, if necessary, contacting) a voltage device 14 and or evaluation and control device 13. An arrangement of the NFC device 11 as close as possible to the voltage device 14 has the advantage that disruptive influences can be reduced. The NFC device 11 thus has, where applicable, a similar detection range 5 to the first or second sensor units 12.1a, 12.1b. It may also be possible, that within door handle 2, a plurality of the NFC devices 11 and/or a plurality of antennas of the NFC device 11 are arranged with differing detection ranges 5. For power supply and/or voltage adjustment, the NFC device 11 is thus electrically connected to the voltage device 14. For data and/or signal exchange, in particular for monitoring input and/or output signals, the NFC device 11 is also electrically connected to the evaluation and control device 13. The appropriate connections are shown in FIG. 10 by dashed lines. Additionally, at least one sensor unit 12.1 within door handle 2 is also connected to the evaluation and control unit 13 for operation, for power supply, for control and/or for measurement acquisition. The evaluation and control device 13 can alternately be arranged outside door handle 2, for example, in the vehicle interior and/or in the vehicle electronics, as is shown by the dashed line. In this manner, for example, a simple connection to the vehicle electronics of the vehicle is possible. In addition, a plug connection 13.6, which has a data link 13.7 as well as an electrical line 13.8 for the power supply, also serves for simple connection to the vehicle electronics, as needed. The voltage device 14, for example, is connected to the supply voltage Ue via line 13.8 for the power supply. The data link 13.7 can be connected to the evaluation and control device 13 and/or directly to the NFC device 11 in order to exchange data (for example, from the data exchange) with the vehicle electronics and/or an external evaluation and control device 13. It is also conceivable that the evaluation and control device 13 forms a monolithic component with the voltage device 14, the evaluation and control device 13, for example, and the voltage device 14 being optionally designed as an integrated circuit, in particular as a micro-controller.
[0057] FIG. 11 schematically visualizes a method 100 according to the invention. In this, a control of the NFC device 11 takes place in a first step 100.1, and only thereafter in step 100.2, thus according to a sequential execution, a control of the sensor device 12 by the evaluation and control device 13.
[0058] The foregoing explanation of the embodiments describes the present invention only in the context of examples. Of course, individual features of the embodiments, provided they are technically feasible, can be freely combined with each other without departing from the scope of the present invention.
LIST OF REFERENCE NUMBERS
[0059] 1 Vehicle [0060] 2 Door handle [0061] 2.1 Handle recess [0062] 2.2 Door panel [0063] 3 External communication device [0064] 4 Object [0065] 5 Detection range [0066] 10 Device [0067] 11 NFC device, communication device [0068] 12 Sensor device [0069] 12.1 Sensor unit [0070] 12.1a First sensor unit [0071] 12.1b Second sensor unit [0072] 13 Evaluation and control device [0073] 13.1 Memory unit [0074] 13.2 Interface unit for vehicle electronics [0075] 13.3 NFC control unit [0076] 13.4 Sensor control unit [0077] 13.5 Switching unit [0078] 13.6 Plug connection [0079] 13.7 Data link [0080] 13.8 Electrical line [0081] 14 Voltage device [0082] 14a First voltage device [0083] 14b Second voltage device [0084] 20 Measurement of the sensor device/capacitance measurement [0085] 20.1 Discharge pulses, cycles [0086] 20.2 Valid measurement [0087] 20.2a First valid measurement [0088] 20.2b Second valid measurement [0089] 20.3 Erroneous measurement [0090] 21 Operating profile of the NFC device/communication device [0091] 21.1 Inquiry pulse [0092] 21.2 NFC data exchange [0093] 22 Operating voltage profile [0094] 22.1 Voltage fluctuations [0095] 22.2 Increased range [0096] 100 Method [0097] 100.1 First step [0098] 100.2 Second step [0099] Ub Operating voltage [0100] Ue Supply voltage [0101] Uh Specified operating voltage level [0102] Uref Reference voltage [0103] t Time [0104] t1 First instant [0105] t2 Second instant
